Apologies, I left a bit out
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You should see the button, then when pressed the dialog which then disappears when a colour selected.
This should give you round swatch selectors. See the at the bottom of the colour picker node. .v-color-picker-swatches__color
seems to control the size & shape of the swatch selectors.
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Note: Color picker component — Vuetify shows how to change the colour mode so you can pick a different output colour mode.